I've been using FF for what seems like years now, but only today have I really
followed up on 'where's the option to change the shortcuts'.
I was using Opera again lately and had gotten used to Ctrl+Z re-opening last closed tab. Nice and easy. In FF it's Ctrl+Alt+T . . or, wait a minute, is it Ctrl+Shift+T
- one of them duplicates current tab, the other does what I'm looking for but I'm damned if I can ever remember which one does which . .
I've just installed Sri's first two suggestions so hopefully that'll sort me out